104 STROMBUS. 



formation is not found in any but a Strombus, it is 

 a sure criterion of the genus, where it does exist. 

 Perhaps very accurate investigation might induce 

 a corrector of the Linnaean catalogue totally to ex- 

 clude all shells in which it is not found. More 

 than one species might safely be considered Mu- 

 rices, others Buccina, and others even Helices. 

 Many of the unfinished shells of this genus resem- 

 ble Coni, and are only to be detected by the length 

 of their spire, which generally exceeds that of any 

 Conus; and sometimes by their tuberculated whorls, 

 which are extremely rare in the latter genus. 

 Strombus was originally used for all turbinated 

 shells, from (rrgo^sM, to turn round ; but is now ex- 

 clusively conferred on those ostracodermata which 

 are distinguished by the construction above ex- 

 plained. 



